Digital mat



FIG. 1 is a perspective view of an ornamental design for a digital mat;

FIG. 2 is a top view thereof;

FIG. 3 is front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a right side view thereof.

The broken lines in FIGS. 5 and 6 form no part of the claimed design. 

CLAIM The ornamental design for a digital mat, as shown and described. 